gistfile1.txt

role Frobber {
    method frob ($x) { say $x }
}

role Frobnicator does Frobber {
    has $.x;
    multi method frob ($x) { self.Frobber::frob($x) }
    multi method frob () { self.frob($.x) }
}

class Frobnify does Frobnicator {}

Frobnify.new(:x("cats")).frob;